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Graphene and preparation method thereof

A technology of graphene and graphene suspension, which is applied in the field of nanomaterials, can solve the problems of complex preparation process and high cost, and achieve the effect of simple operation process, low hazard and cheap raw materials

Inactive Publication Date: 2015-05-13
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Graphene is a widely used two-dimensional all-carbon material, but there is still a problem of high cost in mass production of this material
The preparation of graphene by microwave heating is considered to be a simple preparation process. However, most reports are to oxidize graphite and then use microwave heating to prepare graphene containing a large number of defects and functional groups. A few reports use microwave-assisted electrochemical methods or microwave-assisted Graphene is obtained by heating graphite interlayers, for example, graphite is pre-expanded by electrochemical methods, and then expanded graphite is obtained by microwave heating in an Ar atmosphere, and then graphene is obtained by immersing in N-methyl-1-pyrrolidone and ultrasonically vibrating , and Fu, etc. use FeCl with certain oxidizing properties 3 Make CH 3 NO 2 Infiltrate into the graphite layer, and then use microwave heating to decompose CH 3 NO 2 Graphene with higher purity is obtained, but there are still problems of complicated preparation process and high cost

Method used

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  • Graphene and preparation method thereof
  • Graphene and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] First, at room temperature, stir and mix 1g of graphite powder, 0.5g of ammonium chloride and 50mL of glycerol to obtain a mixed solution; then heat the mixed solution to about 260°C under microwave radiation in the air, and keep it for 0.5 hours, mix The liquid turns brown-black or dark brown-black, and heating is stopped to obtain a well-dispersed graphene suspension; after natural cooling, the graphene suspension is separated to obtain graphene, and then the graphene is deionized The graphene powder can be obtained after washing with water and vacuum drying.

[0022] Wherein, the wavelength of the microwave is 110-160 mm, and the frequency is 2300-2600 MHz. It should be noted that the mixture can also be directly put into a microwave oven, and the graphite powder can be microwave-heated in the air under normal pressure to directly prepare high-quality graphene powder.

Embodiment 2

[0024] First, at room temperature, stir and mix 3g of graphite powder, 1g of ammonium sulfate, and 200mL of diglycerin to obtain a mixed solution; then heat the mixed solution to about 280°C under microwave radiation in the air and keep it for 0.6 hours, and the mixed solution becomes Brown-black or dark brown-black, stop heating to obtain a well-dispersed graphene suspension; after natural cooling, the graphene suspension is separated to obtain graphene, and then the graphene is washed with deionized water, The graphene powder can be obtained after vacuum drying.

[0025] Wherein, the wavelength of the microwave is 130-170 mm, and the frequency is 2380-2680 MHz. It should be noted that the mixed solution can be directly put into a microwave oven, and the graphite powder can be microwave-heated in the air under normal pressure to directly prepare high-quality graphene powder.

Embodiment 3

[0027] First, at room temperature, stir and mix 2g of graphite powder, 0.5g of ammonium chloride, 50mL of glycerol and 20mL of ethylene glycol to obtain a mixed solution; then heat the mixed solution to about 230°C under microwave radiation in the air, and keep After 0.7 hours, the mixed solution turned brown-black or dark brown-black, and the heating was stopped to obtain a well-dispersed graphene suspension; after natural cooling, the graphene suspension was separated to obtain graphene, and then the graphite Graphene powder can be obtained after washing with deionized water and drying in vacuum.

[0028] Wherein, the wavelength of the microwave is 135-155 mm, and the frequency is 2400-2660 MHz. It should be noted that the mixture can also be directly put into a microwave oven, and the graphite powder can be microwave-heated in the air under normal pressure to directly prepare high-quality graphene powder.

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Abstract

The invention discloses a graphene preparation method, including the following steps: mixing and stirring graphite powder, ammonium salt and polyol or a polyol aqueous solution, and heating the liquid mixture under the microwave radiation until the liquid mixture becomes black brown or dark brown and black to obtain graphene suspension. According to the graphene preparation method, the graphite powder, ammonium salt and high boiling point polyol liquids are mixed, and heated under the condition of microwave, the ammonium salt is infiltrated into graphite inlayer for decomposition and chemical combination reaction, so that the graphite is easy to delaminate in vibration, and high-quality graphene can be obtained.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing graphene. Background technique [0002] Graphene is a widely used two-dimensional all-carbon material, but there is still a problem of high cost in mass production of this material. The preparation of graphene by microwave heating is considered to be a simple preparation process. However, most reports are to oxidize graphite and then use microwave heating to prepare graphene containing a large number of defects and functional groups. A few reports use microwave-assisted electrochemical methods or microwave-assisted Graphene is obtained by heating graphite interlayers, for example, graphite is pre-expanded by electrochemical methods, and then expanded graphite is obtained by microwave heating in an Ar atmosphere, and then graphene is obtained by immersing in N-methyl-1-pyrrolidone and ultrasonically vibrating , and Fu, etc. use FeCl with certain oxidi...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 嵇天浩马楠
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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